Although we’re all about Microsoft’s ecosystem around these parts, we’re not going to pass on a good deal especially if you have a specific need. Box (box.com) cloud storage, akin to Dropbox, SkyDrive and SugarSync, is a cloud based syncing and storage service.
They usually offer 5GB of space for free but have a special running where you get bumped up to 25GB (new customers only).
What makes Box a compelling option is of course their Windows support--they have a full desktop sync client and Windows 8 RT app in addition to sporting an official app for Windows Phone 7.x and 8 (suck on that, Dropbox). The app is quite good and similar to the SkyDrive experience.